Process for the manufacture of a composite yarn which is provided with spaced slubs



G. CERUTTI ET AL 3,438,194

April 15, 1969 PROCESS FOR THE MANUFACTURE OF A COMPOSITE YARN WHICH IS PROVIDED WITH SPACED SLUBS Sheet I of 2 Filed Nov. 2, 1967 67A (0M0 mum mow/0 FA/PAC/ FA 8/ 7'0 VA GL/ER HNVENTORS ATTORN EYS April 15, 1969 3, u-rn ET AL 3,438,194

PROCESS FOR THE MANUFACTURE OF A COMPOSITE YARN wmcn IS PROVIDED WITH SPACED SLUBS Filed Nov. 2, 1967 Sheet 2 of 2 G/AKOMU CERUTT/ GIORGIO F/WAC/ FAB/0 70m GIL/ER! INVENTORS BY flywm, m 3% ATTORNEYS United States Patent i 3,438,194 PROCESS FOR THE MANUFACTURE OF A COM- POSITE YARN WHICH IS PROVIDED WITH .SPACED SLUBS Giacomo Cerutti, Giorgio Faraci, and Fabio Tovaglieri, Gozzano, Italy, assignors to Bemberg S.p.A., Milan, Italy, an Italian company Filed Nov. 2, 1967, Ser. No. 680,194 Claims priority, application Italy, Nov. 24, 1966, 30,338/ 66; May 31, 1967, 16,739/67 Int. Cl. D02g 3/02 US. Cl. 57-157 9 Claims ABSTRACT OF THE DISCLOSURE Process for the manufacture of a composite yarn comprising two or more component yarns, the composite yarn being provided along its length with spaced slubs, wherein said slubs are obtained by intermittently varying the feed rate of at least one of the component yarns.

The invention relates to a process for the manufacture of a yarn which consists of two or more component yarns and which, along its length, is provided with spaced slubs, in which process the feed rate of at least one of the component yarns is varied, and the assembled component yarns are treated in a jet device with a turbulent stream of a gaseous medium and subsequently, by way of a traversing twisting ring with a traveller revolving thereon, wound to a package on a tube placed on the rotating twisting spindle.

A process of this type and the yarn manufactured thereby are known. The known yarns have the disadvantage that their handle does not fully satisfy the requirements made in connection with certain uses.

The invention has for its object to obviate the abovementioned disadvantage. The process according to the invention is characterized in that the spaced slubs in the composite yarn are formed by intermittently practically stopping the supply of one of the component yarns for short periods of time and simultaneously reducing the tension in the other component yarn or yarns. As a result, there are formed spaced slubs, which impart to the yarn according to the invention a special handle, which renders the yarn more suitable for special applications in the textile trade. Advantageously the time during which the supply of one of the component yarns is stopped is according to the invention about 2 to 5 seconds. A favourable embodiment of the process according to the invention is characterized in that the tension in the component yarn of which the supply is intermittently stopped rises during the stop to a value of about 0.6 grammes per denier. According to the invention the speed of the intermittently stopped component yarn preferably is, between the stops, about 200 to 300 m./ min.

According to the process briefly outlined above, the size of the slubs formed on the composite yarn is almost constant along the composite yarn, provided that the thread guide, which feeds one component yarn to the jet device, is in a fixed position. However, for particular purposes, it would be desirable for the size of said slubs, along the same length of composite yarn, both as to thickness and as to length, to be greatly varied. In otherwords, on the same length of composite yarn, short and thick slubs as well as longer and thin slubs should be provided. Thus, according to another embodiment of the process of the present invention, there is formed a composite yarn having, along its length, spaced slubs of variable size, by causing the thread guide to continuously vary its position with respect to the feed point of the second component yarn, in accordance with a predeter- 3,438,194 Patented Apr. 15, 1969 mined program according to the particular requirements of the composite yarn to be formed.

The invention will be further described with reference to the annexed schematic drawings, wherein:

The FIG. 1 schematically shows the path of the yarns at one winding position, where two drawn component yarns are combined to a composite yarn.

The FIG. 2 shows another embodiment having a mobile thread guide.

The FIGS. 3 and 4 show two illustrative mechanisms suitable for providing a reciprocating movement of the thread guide of the embodiment of FIG. 2.

A component yarn 1 is passed through a thread guide 2, over the tensioning pins 3 and 4, and through an adjustable yarn tensioning device 5, which may, for instance, be a known disk tensioner. Subsequently, the component yarn 1 is passed by way of a thread guide 6 to a known jet device 7, in which, under the influence of a turbulent air stream, the component yarn 1 is entangled with the other component yarn 8 to form a composite yarn 9. By way of a twisting ring 10, which traverses in the direction indicated by the arrows, and a traveller revolving thereon the composite yarn 9 is wound on to a tube 11, which is mounted on a driven twisting spindle (not shown).

The other component yarn 8 is passed through a thread guide 12 and over tensioning pins 13 and 14, and is given a few wraps around a pressure roller 15 with idler pulley 16. The pressure roller 15 presses on a driven roller 17, and is mounted in a lever 18, which can. swing on a shaft 19. The pressure roller 15 with idler pulley 16 and the driving roller 17 together form the supply system for the component yarn 8.

After the component yarn 8 has left the yarn feed rollers 15, 16, 17 it is passed to the tangling device 7 where it is entangled with the component yarn 1 to form the composite yarn 9.

The apparatus shown in the drawing is further provided with means for producing spaced bulky slubs in the composite yarn. A suitable current source feeds a circuit 20, which comprises a switch 21 which is operated by a switching wheel 22 rotating in the direction indicated by the arrow and provided with irregularly spaced switching pins 23, which are adapted to open the circuit 20. When the circuit is closed, for instance for 2 to 4 seconds, relays 24, 25 and 26, which are of a known type, are excited. When the relay 24 is excited, the arm of the lever 18 is pulled, as a result of which the pressure roller 15 disengages the driving roller 17, so that the pressure roller is not driven any longer. By exciting the relay 25 a magnetic brake provided in the pressure roller 15 is operated to brake and stop said roller 15. Excitation of the relay 26 reduces the tension of the supplied component yarn 1 through the adjustable yarn tensioning device 5.

When the supply of the component yarn 8 is abruptly stopped, the twist inserted into the composite yarp 9 owing to the winding process runs back along the yarn to a point upstream of the jet device 7. The tension in the component yarn 8 then rises to, for instance, 0.6 grammes per denier, and because the tension in the component yarn 1 has becomevery low, the component yarn 1 is, over a short distance, wound around the component yarn 8, as a result of which there is formed in the yarn a short slub 28. The component yarn 8 pulls the component yarn 1 towards itself through the top eyelet 6, which, as can be seen from the drawing, limits the size of the slubs. When the circuit 20 is opened again by one of the pins 23 of the switching wheel 22, the excitation of the relays 24, 25 and 26 is removed, upon which the formation of a slub 28 is stopped and the two component yarns are for some time tangled in the normal way to form a composite yarn 9.

When the three relays 24, 25 and 26 are not excited, the tension in the component yarn 1 is about 0.1 to 0.25 grammes per denier, and the tension in the component yarn 8 is about :05 to 0.15 grammes per denier. In experiments carried out the denier of the component yarn 1 was 40 20 filaments) and the denier of the component yarn 8 was 70 (20 filaments), and the speed of the twisting spindle was about 5000 r.p.m.

Considering now the FIG. 2, the component yarn 1 (shown in solid line) is passed through a mobile thread guide 30 (corresponding to the fixed thread guide 6 of FIG. 1), which occupies the position A, toward the jet device 7, of a known type, in which, under the action of a turbulent air stream, the component yarn 1 is entangled with the second component yarn 8, to form a composite yarn 9, which is, thereafter wound onto a tube mounted on a driven twisting spindle (not shown in. the FIG. 2).

The thread guide 30 is connected to a device which provides the reciprocating movement of the thread guide 30, said device being enclosed in a casing 31, which is mounted on a suitable support, e.-g. the wall 32. When the thread guide is in the position A, and simultaneously the feed of the component yarn 8 is stopped and the tension of the component yarn 1 is released, the latter is wound around the component yarn 8, thus forming the slub 28', following the radially distributed lines 33. When the thread guide 30 occupies the position B, i.e. after the completion of an advancing motion, the component yarn 1 being now positioned along the dash-and-dot line 34, upon stopping the feed of the component yarn 8 and simultaneously releasing the tension on the component yarn 1, the latter is as before wound around the com ponent yarn 8, thus forming the slub 28", but it is now distributed along the radial lines 35. It is evident that in this second case the slub obtained is thicker and shorter than the slubs formed when the thread guide 30 is in the position A.

In the embodiment of FIG. 2, the thread guide 30 makes an alternative reciprocating motion as indicated by the arrow 47. This motion, i.e. from the position A to the position B and vice versa, may be effected during the motion of both the component yarns, but, if so required, it may also be effected during the feed stopping of the component yarn 8.

Moreover, the sequence of the slubs 28' and/or 28" is by no means necessarily alternated. For example, a program can be predetermined, so that the sequence of said slubs is in accordance with a desired succession, this being achieved by well-known means, as for example, mechanical or electrical scheduling apparatus.

The FIGS. 3 and 4 show, as aforesaid, two devices suitable for imparting to the thread guide 30 said reciprocating motion. It should, however, be stated that the invention is in no way limited to said embodiments, a number of other devices being conceivable, e.g. electrical or pneumatic devices, which are contemplated in the scope of the invention.

Referring to the FIG. 3, the thread guide eyelet 30 is connected to the link motion mechanism 36. The wheel 37, driven by motor means, not shown, in the direction of the arrow 38, is provided with a pin 39 eccentrically fixed thereon; the pin 39, which is inserted into the slot 40 of the link motion mechanism 36, causes a reciprocating motion of the latter, and, as a consequence, of the thread guide30.

In FIG. 4, the thread guide 30 is connected to a rack 41. To the rack 41 there are geared two segmental partially toothed gears 42 and 43, which are also capable of being mutually geared. In the position shown in FIG. 4, the gear 42 being on the point of engaging, in the direction of the arrow 48, the gear 43 through its toothed sector 44; the gear 43 in turn being engaged through its toothed sector 45 with the rack 41. When the gear 42 engages the gear 43, the rack 41 is caused to translate to the right side in FIG. 4, and as a consequence also the thread guide 30, being connected to the rack 41, is likewise translated. Successively the toothed sector 44 of the gear 42 disengages the gear 43, whereas the gear 42, continuing its rotation, engages the rack 41 with the other toothed sector 46, thus causing the rack 41 and the thread guide 30 to translate oppositely, whereas also the gear 43 is restored to the position shown in the figure. When the toothed sector 46 of the gear 42 disengages the rack 41, a new cycle begins.

Whereas in the illustrated embodiments the reciprocating motion of the thread guide eyelet 30 follows a rectilinear path, the invention is not limited thereto, because a curvilinear path is also contemplated in the scope of the invention.

Moreover, in the embodiments shown, the position of the thread guide is varied by changing the distance of the thread guide with respect to the other component yarn. However, this position may be varied also with this distance kept constant, provided that the reciprocating motion is made parallel to the second component yarn. In this case, the size variation of the spaced slubs is obtained when the thread guide eyelet is kept in fixed position during the formation of the slub and successively is caused to move during the formation of the next slub. In this latter case the slub will be longer and thinner.

Within the scope of the invention modifications may be made.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A process for the manufacture of a composite yarn which consists of at least two component yarns and which, along its length, is provided with spaced slubs, in which process the feed rate of at least one of the component yarn is varied, and the assembled component yarns are treated in a jet device with a turbulent stream of a gaseous medium and subsequently, by way of a traversing twisting ring with a traveller revolving thereon, wound to a package on a tube placed on the rotating twisting spindle, characterized in that the spaced slubs in the composite yarn are formed by intermittently practically stopping the supply of one of the component yarns for short periods of time and simultaneously reducing the tension in the other component yarn or yarns.

2. A process according to claim 1, characterized in that the time during which the supply of one of the component yarn is stopped is about 2 to 5 seconds.

3. A process according to claim 2, characterized in that the tension in the component yarn of which the supply is intermittently stopped rises during the stop to a value of about 0.6 grammes per denier.

4. A process according to claim 1, characterized in that the tension in the component yarn of which the supply is intermittently stopped rises during the stop to a value of about 0.6 grammes per denier.

5. A process according to claim 1, characterized in that the speed of the intermittently stopped component yarn is, between the stops, about 200 to 300 m./min.

6. A process according to claim 1, characterized in that one or more of the component yarns have been drawn.

7. A process according to one or more of the preceding claims, characterized in that the component yarns consist of polyamide or polyester.

8. A process for the manufacture of a composite yarn which consists of at least two component yarns, and which, along its length, is provided with spaced slubs, as claimed in claim 1, wherein the size of said spaced slubs depends on the position of a thread guide eyelet, into which one or more component yarns are passed, the tension thereof being periodically varied with a simultaneous stopping of the supply of the other component 5 6 yarn(s), characterized in that the position of said thread 3,013,379 12/1961 Breen 57157 guide with respect to the other component yarn(s) is 3,113,413 12/1963 J-acobs et a1 57--157 XR continuously varied by means of a reciprocating motion 3,144,747 8/1964 Pal-n1 et a1. 5791 XR between two end positions, said variation being in accord- 3,253,396 5/ 1966 Fish 5734 ance with a predetermined program. 3,381,346 5/ 1968 Benson 5734 9. Composite yarn manufactured by the process aca di w 1 i 1 DONALD E. WATKINS, Primary Examiner.

References Cited UNITED STATES PATENTS 10 2,731,789 1/1956 Holder 5791 XR 

